Blood donation testing for HIV and CDC testing for HIV are generally CDC-approved. HIV testing generally requires two parts: a primary screening test and a confirmatory test. Blood donation testing and various healthcare facilities conduct a primary screening test, which is unable to rule out window-period infections. The HIV antibody test is the gold standard for the diagnosis of HIV infection and is also known as the confirmatory test, which is conducted by the CDC. Therefore, blood donation centers and medical institutions will generally send blood suspected of being infected with HIV to the CDC for confirmation. In addition, blood is tested for various infectious diseases such as syphilis, hepatitis B, hepatitis C, etc., prior to donation, and the use of the blood product will only be considered if it is free of any infectious disease.